Journal of Nanoparticle Research

, Volume 11, Issue 3, pp 665–670

The third-order optical nonlinearity and upconversion luminescence of CdTe quantum dots under femtosecond laser excitation

Authors

    • Research Center for Analytical InstrumentationCollege of Information Science and Engineering, Zhejiang University
  • Wenzhi Wu
    • School of Electronic Engineering, Heilongjiang University
    • Center for Condensed Matter Science and Technology, Department of PhysicsHarbin Institute of Technology
  • Yuxi Yan
    • Jilin Province Research Center for Engineering and Technology of Spectral InstrumentsJilin University
  • Weilong Liu
    • Center for Condensed Matter Science and Technology, Department of PhysicsHarbin Institute of Technology
  • Aihua Li
    • Center for Condensed Matter Science and Technology, Department of PhysicsHarbin Institute of Technology
  • Yanqiang Yang
    • Center for Condensed Matter Science and Technology, Department of PhysicsHarbin Institute of Technology
  • Wenhui Su
    • Center for Condensed Matter Science and Technology, Department of PhysicsHarbin Institute of Technology
Research Paper

DOI: 10.1007/s11051-008-9416-x

Cite this article as:
Jin, Q., Wu, W., Zheng, Z. et al. J Nanopart Res (2009) 11: 665. doi:10.1007/s11051-008-9416-x

Abstract

The aqueous CdTe quantum dots (QDs) were synthesized by the electrostatic reaction method. The optical properties of CdTe QDs were investigated by femtosecond Z-scan and time-resolved luminescence technique in nonresonant spectral region. The nonlinear absorption and refraction are ascribed to two-photon absorption, and time-resolved upconversion photoluminescence produces biexponential decay pattern at infrared femtosecond laser excitation. Upconversion luminescence is composed of a band-edge excitonic state and a photoinduced trapping state. The short-lived band-edge excitonic emission is independent of the detection wavelengths, and long-lived species becomes even longer with the increase of detection wavelengths, which indicates the size dependence of surface excitonic emission.

Keywords

CdTeQuantum dotsOptical nonlinearityTime-resolved luminescence dynamicsNanomaterials

Supplementary material

11051_2008_9416_MOESM1_ESM.doc (26 kb)
(DOC 26 kb)

Copyright information

© Springer Science+Business Media B.V. 2008